heater blower motor will not shut off eithr by the heater switch or the key switch. have to pull the fuse.heater blower motor will not shut off eithr by the heater switch or the key switch. have to pull the fuse.

2 Answers

I had the same problem. depends what kind of trim model you have. but if you look on the passenger side floor right under the glove box is where your heater unit is. if you take off the cover to it. their will be a little squarebox looking thing with 2 - 3 wires coming out of it and goin to the blower motor unit . Tap the square box with a screwdriver while your blower motor is on off mode. it should shut off if you give it a couple good solid taps. dont be afraid to hit it. that little square thing might have to be replaced if it turns off when you hit it. or just may have to be cleaned.

Needs a blower motor module. I just replaced the one on mine. About 125 dollars.Located on the pasenger side under the glove box. Remove the kick plate, two screws you will see a square module unit. It is held in place with two screws also. Two wire connectors to unhook. It took about 20 minutes to replace once I located it. Hope this helps.

My 2003 Sierra's blower came on by itself in the garage while I was sleeping and ran the battery completely down. I had to replace the blower switch located under the glove box next to the blower at the bottom of the right corner of the dash. The switch is in front of the blower and held in by two screws. Disconnect the two wire connections. This is a "dealer only" part and cost me 65.00. Also check the wire harness with seven wires connected to it for melted plastic. It will be marked "ABCDEFG". If it has melted, you'll need to replace it. Pay attention when reinstalling either part, that the wires "ABCDEFG" match the switch in that order.

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Jan 10, 2008 - 11 posts - ‎7 authors
I have read through many posts on blower motor issues but no one had the same issue I have. ... If I shut the truck off, it still won't shut off and runs until the battery is dead.... 2002 GMC Sierra RCLB 1500 4X4 SLE, 7 1/2' Fisher plow.

www.gm-trucks.com > ... > Ask the GM TechnicianJan 11, 2008 - 8 posts - ‎3 authors
I have a 2003 GMC Sierra and just today when I shut my vehicle off I ... which did stop the blower, but when I put the fuse back in the blower ... 2004-2006 Chevrolet Avalanche, Silverado, Suburban, Tahoe ... 2004-2007 GMC Envoy Models ... This information DOES NOT apply to any other blower motor ...

Not blowing any air , hot or cold ?
blower is fine ???? How do you know the blower is fine if not blowing any air ? Doesn't work any speed ? High , low , med.
Blower motor , resistor or relay . Watch this video ! Do you have a volt meter , know how to test automotive electrical circuit's ?Blower Motor Problems Auto Repair Help
Free wiring diagram here http://www.bbbind.com/free_tsb.html Look for the correct fuse's for the blower motor .
Enter vehicle info. year , make , model and engine size. Under system click on HVAC ,under subsystem HVAC controls will pop up automatic. Click search button then first blue link . Look at diagram to see which fuse is for the blower . Test voltage with volt meter

My 2003 Sierra's blower came on by itself in the garage while I was sleeping and ran the battery completely down. I had to replace the blower switch located under the glove box next to the blower at the bottom of the right corner of the dash. The switch is in front of the blower and held in by two screws. Disconnect the two wire connections. This is a "dealer only" part and cost me 65.00. Also check the wire harness with seven wires connected to it for melted plastic. It will be marked "ABCDEFG". If it has melted, you'll need to replace it. Pay attention when reinstalling either part, that the wires "ABCDEFG" match the switch in that order.